Rotors of rotary engines



G. DE CQYE DE CASTELET RoToRs oF ROTARY ENGINES Filed March 3l, 1965INVEM'QR CTEL. n DQCOJDQ Cdsfe /e ananas Patented Jan. 24, l9673,299,863 RTRS F RTARY ENGNES Gatan de Coye de Castellet, Billancourt,France, as-

signor to Regie Nationale des Usines Renault, Biilan court, France FiledMar. 31, 1965, Ser. No. 444,134 Claims priority, application France,Apr. 4i, 1964i, 969,796, Patent 1,398,965 1 Claim. (Cl. 12.3-8)

The parts or a rotary engine, especially the rotor, are subjected to athermal flux and also to heat stresses which make special coolingarrangements necessary.

A known solution consists of arranging a circulation of a cooling liquidin the interior of the rotor, this circulation being effected bystarting from the hottest zones.

It is known that in rotary engines of the type having tive workingchambers in the stator and with four lobes on the rotor, ve explosionsare `produced for one-half revolution of the rotor, and since the rotorand the stator act like two gears differing by one tooth, and since onthe other hand the order of tiring is 1, 3, 5, 2, 4, the result is thatonly two opposite lobes are associated with the explosions of the enginewhich subjects them to high thermal and mechanical fatigue stresses,whereas the tWo other lobes are less affected by the working of theengine.

In a prior application, the present applicants have proposed to arrangeinside the rotor two conduit systems for the cooling liquid, each ofthese comprising a radial intake conduit leading the liquid to aperipheral conduit which rst passes round a hot lobe and then a coldlobe, before bringing the said cooling liquid baclt to a radial outgoingconduit.

The present invention has for its object an improved circuit arrangementfor the cooling liquid, for the purpose of reducing the weight andsimplifying the assembly of `the rotor. To this end, the liquid isbrought in from the hub through radial conduits directly to the summitsof the hot lobes, from which it passes into chambers located on eac-hside and extending under the cold lobes, but without any lperipheralcirculation channel being provided, the liquid returning throughpassages opening from these chambers into the hub.

With this arrangement, it is possible during moulding to give the coreslarge central bearing surfaces which enable them to be held in positionin the ymould without dificulty, the cleaning of the moulded parts beingeffected easily and completely.

One form of construction in accordance with the invention has been shownby way of example in the accompanying drawings, in which:

FIG. 1 is a transverse section of a rotor;

FIG. 2 is a cross-section taken along the line lI-II of FIG. 1;

FIG. 3 is a cross-section along the line III-lll of FIG. 1.

The rotor 1 according to the invention comprises four lobes 2, 3, d, 5,two of which, 2 and 4 having opposite summits and intended to functionas hot lobes, are provided radially wit-h hollow arms 6, '7, formingpassages for the cooling liquid and opening into the hub 8. The interiorportion ot' the rotor is divided-up by the arms 6 and 7 and thepartitions 9 and 10 into our chambers 11, 12, 13 and 14, into which thecooling liquid passes through the extremities of the arms 6 and 7 whichcommunicate respectively with the two adjacent chambers, and from whichthe said liquid is evacuated through the openings 15, 16, 17 and 18,after 'having passed through the cold lobes, but without any denitelyestablished circulation being produced in this Zone. Transverse webs 19,20, 21 and 22, couple together the sides 23 and 24 of the rotor.

It can be seen that with this conformation of the rotor, the cores whichserve for casting the hollow portions can be given large central bearingsurfaces which enable them to be held easily in position in the mouldand further ensures easy cleaning of the cast parts.

What is claimed is:

A rotor for a rotary engine of the type having a stator and a rotor,five Working chambers in said stator and four lobes in said rotor, twoof said lobes working as hot lobes, the other two as cold lobes, saidrotor comprising an annular surface, side plates and a hub with aninternal surface, in w-hich said rotor is provided with a cooling systemconstituted by two hollow radial arms, each extending between said huband the summit of one of said hot lobes, passages being provided closeto t-he periphery between said arms and the adjacent chambers formedbetween the hub and the periphery, said ar-ms and intermediate internalpartitions, the circulation of cooling liquid taking place rst throughsaid arms, then through the chambers and returning through openings intothe interior of said hub.

References Cited by the Examiner UNITED STATES PATENTS 3,102,682 9/1963Paschke 230-145 3,111,884 11/1963 Peras 123-8 3,112,870 12/1963 Bentele230210 3,131,679 5/1964 Peras 103-130 3,176,915 4/1965 Bentele et al.230-210 3,204,614 9/1965 Huber 230-210 3,206,109 9/1965 Paschke 230-145v FOREIGN PATENTS 1,359,797 3/1964 France. 1,372,662 8/1964 France.

978,210 12/1964 Great Britain.

DONDEY l. STOCKING, Primary Examiner.

W. I. GOODLIN, Assistant Examiner.

